Development: Debugging

For the ease of debugging, a couple of Debugger Visualizers have been created. They facilitate looking at encapsulated data types such as fixed-point numbers and packed integers. The visualizers can be found in build/vs/debug. The readme in this directory explains how to set them up for Visual Studio versions prior to VS2015. VS2015 finally makes it possible to include debug visualizers as part of the solution file, so there is no need to enable them manually.